If your having trouble with Astral Projecting, i have some tips that have worked for me and others. Here is a few that i thought would be the most important:

1. Just try to relax, and let it happen naturally.
2. Before Astral Projecting, you should try some breathing exercises to make sure that your completely calmed down.
3. You should always try to Astral Project in a calm, quite place with an area that is flat for you to lay down.
4. dimming the lights helps a lot with getting calmed down.
5. Don't be discouraged if you don't succeed the first time. it took me a wile to get the hang of it to.

If you have any further questions, feel free to mail me and i'll try my best to help you with it.